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Subject
Environment
25
Biology and Ecology
16
Farming
15
Structure
14
Boundaries
12
Imagery and Base Maps
8
boundaries
8
Administrative and political divisions
7
Agriculture
7
Inland Waters
7
Society
7
Utilities and Communication
7
Economy
6
transportation
6
Biogeography
5
Crops
5
society
4
Animal populations
3
Irrigation
3
Rangelands
3